(1) The radiator is used for LED, but the design of the wiring terminal and radiator of the LED connection cannot meet the level of IP45 and above, and cannot meet the requirements of the GB7000.5/IEC6598-2-3 standard.

(2) Using ordinary road lamps shells, use matrix LEDs in the light surface of the lamp. Although this design can meet the IP test, because the inadequate ventilation in the lamp will cause Under such high working conditions, the luminous efficiency of LED is not high under such high working conditions. At the same time, the service life of LEDs will also be greatly reduced. In fact, there are obvious unreasonable conditions.

(3) The instrument fan is used in the lamp to heat the LED and the radiator. Their air inlet is designed below the lamp to avoid the entry of rainwater. The air outlet is designed around the LED light source. This can also effectively avoid the entry of rainwater. In addition, the radiator and LED (light source) are not in the same cavity. This design is good as it is done. According to the IP test requirements of the lamp, it can be passed smoothly. This plan not only solves the heat dissipation problem of LED, but also meets the requirements of IP levels. But this seemingly good design actually has obvious unreasonable situations. Because in the use of most road lamps in our country, the amount of dust in the air is large, and sometimes it will reach a large (such as the dust storm). This type of lamp is used for a period of time under general conditions (about three months to to For half a year), the gap of the internal radiator will be filled with dust, which greatly reduces the effect of the radiator. In the end, it will also make the LED significantly shortened due to the high working temperature. The shortcomings of this plan are that they cannot be used lasting and well.

It is necessary to take into account the heat dissipation and IP protection of LEDs in the street lamps. The more reasonable design guidance ideas are:

A. In the key heat dissipation location, the heat conduction board is used. The thermal conductive board is inside the metal board. It has a detailed custody of refrigerant flow, and is filled with refrigerant in the detailed controller. When a certain part of the thermal conductive board is heated, the refrigerant in the detailed pipe will quickly flow and quickly make the heat quickly flowing the heat quickly. Ground guide. The heat conduction coefficient of a good thermal conductivity can reach 8 to 12 times that of the same thickness copper board. Although the price is high, if it is used in key parts, the heat dissipation of LED will play a role in half the effort.

b. Design the shell of the lamp into a heat sink. Most road lamps cases are aluminum. Direct use of the outside of the lamp shell as the heat sink can ensure the requirements of the IP protection level, but also to obtain a large heat dissipation area. It can be washed through natural wind and rain, which can ensure the continuous effectiveness of the radiator.